condition mean min max ZT0-3 19.25 19.25 19.25 ZT4-7 33.1 33.1 33.1 ZT8-11 43.3 43.3 43.3 ZT12-15 14.75 14.75 14.75 ZT16-19 4.3 4.3 4.3 ZT20-23 2.6 2.6 2.6